Listening Receiver Kasia - L7: Coil L7 Specifications, Inductance, Tap Point, 10uH & 4.7uH Cables

Hello

What should the L7 coil look like? What inductance and at what point should the tap be done?

Yes, I connected a 10uH cable gland and a 4.7uH cable at the tap.

Please help.

L7 coil on Amidon T37-2 toroidal core 9.53x5.21x3.25 AL = 4, coil 20 turns DNE 0.35 with tap on 5 turns from the mass side.

With different cores, the number of turns will change.
The parameters of the coil on Amidon can be calculated in available calculators on the net.

OKAY. Thank you 73!

I have one more problem. The receiver means 60-225 kHz, i.e. on long waves .... heh

Maybe there is some error in the schematic? This capacitor at R3 (47k) must be 100pF and not 100nF?

I don't want to make a noise either.

Promóżcie ......

There is no 100pF capacitor around R3.
Is C8 100nF, C9 220pF and C10 10pF.
Capacitive D1 diode can be with a green dot.

But I think 100nF is too much. Such capacity in the VFO circuit?

C8 100nF works as an "average" of the voltage supplied from the tuning potentiometer R1. Its main task is to eliminate crackling and noise when tuning and short-circuiting high voltage residuals to ground.
100nF is the most correct value. If there were even 220nF it would also be OK

So how do you fix this malfunction (increase frequency)?

What frequency does VFO generate for you?
You won't go any further without this knowledge.

When connecting a frequency meter under C15 (10pf) it indicates 60-225 kHz

There was some confusion here with confusion. The inductance you connected is definitely not 10 uH, but much, much more. Rather, it looks like inductance measured in milliliters. On the other hand, the tunable 60 - 225 kHz frequency range will definitely not be available for the BB 105 capacitive diode. This is a range of other quantities !!!! Check what you have installed there because some nonsense is coming out. Notes on capacitance given by c2h5oh are correct, and these capacities do not affect the frequency of the generator. Check the varicap you have used, because BB105, for the frequency measured in kilohertz, will change this frequency but not more than 1 khz in the whole range of tuning.

Added after 11 [minutes]:

I will add that the unhooking you ask for is to be about 20 percent of the total number of turns of the coil from the connection to ground.